The war meant to stop Iran's nuclear program has made verifying that program impossible — and IAEA chief Grossi warns the problem will outlast the bombs
Executive Summary
- The IAEA has revealed a new, fourth uranium enrichment facility in an underground complex in Isfahan — but cannot determine whether centrifuges have been installed or if it's just "an empty hall." Inspectors were evacuated before visiting the site when Israel attacked in June 2025, and the war has prevented any return.
- A drone/projectile struck the Bushehr nuclear power plant complex on Tuesday evening, March 18, causing no nuclear damage or casualties but underlining the risk of radiological incidents. IAEA chief Rafael Grossi condemned the strike, saying "any attack on any nuclear facility should always be avoided."
- Grossi delivered a stark warning in Washington: war cannot eliminate Iran's nuclear program. Iran's 440.9 kg of 60% enriched uranium — enough for roughly 10 weapons — remains unverified and potentially unaccounted for. The very war launched to prevent nuclear proliferation has created a verification vacuum that makes the nuclear threat harder to assess and harder to contain.
Chapter 1: The Fourth Facility — Isfahan's Underground Mystery
When IAEA director general Rafael Grossi appeared before journalists in Washington on Wednesday, March 18, he revealed something that had been quietly gnawing at the international nonproliferation community: Iran has a new uranium enrichment facility buried in an underground complex in Isfahan.
This would be Iran's fourth known enrichment plant, alongside two sites at Natanz and one at Fordow. Iran notified the IAEA of the new facility on June 10 or 11, 2025 — just days before Israel launched strikes against Iran's nuclear infrastructure on June 13. Inspectors dispatched to the area had to be evacuated before they could set foot inside.
Nine months later, the IAEA still doesn't know what's inside.
"It is underground, but we haven't visited it yet," Grossi told reporters. "There are many questions that we will only elucidate when we are able to go back." The facility could be "simply an empty hall" — or it could be an operational enrichment cascade already spinning centrifuges. Nobody outside Iran knows.
This is the nuclear equivalent of Schrödinger's box: a facility that simultaneously exists and doesn't exist as a proliferation threat, precisely because the war has made verification impossible. Iran blocked IAEA inspectors from visiting bombed enrichment sites at Natanz after the 12-day war in June 2025. The current conflict, now in its 19th day, has shut down verification entirely.
Iran's Nuclear Balance Sheet
| Metric | Status |
|---|---|
| 60% enriched uranium | ~440.9 kg (enough for ~10 weapons if enriched to 90%) |
| Known enrichment facilities | 4 (Natanz x2, Fordow, Isfahan — new) |
| Isfahan facility status | Unknown |
| IAEA inspector access | None since June 2025 |
| Natanz entrances | Struck again March 3, 2026 |
| Bushehr nuclear plant | Drone/projectile hit March 18, no nuclear damage |
Chapter 2: The Bushehr Near-Miss
On Tuesday evening, something struck the grounds of Iran's only operational nuclear power plant at Bushehr. Russia's Rosatom CEO Alexey Likhachev reported that the projectile hit "close proximity to the operating power unit." Iran blamed the U.S. and Israel. About 480 Russian technicians remain at the facility.
Grossi said the damage appeared to have been caused by a drone and "doesn't seem to be very significant." The reactor was unaffected, no radiation was released, and no casualties occurred. But the incident raised a chilling question that has shadowed the entire conflict: what happens when a war zone includes an operating nuclear power plant?
Bushehr runs a 1,000-megawatt pressurized-water reactor fueled by Russian-supplied 4.5% enriched uranium. Unlike the enrichment facilities at Natanz that were deliberately targeted, Bushehr is a civilian power plant that both sides had left untouched during the June 2025 12-day war. The March 18 incident broke that tacit understanding — or at least blurred its edges. U.S. Central Command did not respond to requests for comment, and it remains unclear whether the projectile was a deliberate strike, shrapnel from air defense fire, or something else entirely.
The Chernobyl Precedent
The parallels to Ukraine's Zaporizhzhia nuclear power plant — which sat on the front lines of Russia's war — are unavoidable. In both cases, a working nuclear reactor sits inside an active war zone, and the international community is largely powerless to guarantee its safety. The difference: Bushehr sits on the shores of the Persian Gulf, meaning any radiological release could contaminate waters shared by Kuwait, Saudi Arabia, Qatar, the UAE, and Bahrain — countries already suffering from Iran's retaliatory strikes.
Chapter 3: Grossi's Warning — The Limits of Military Nonproliferation
The most consequential statement of the day came not from any general or diplomat, but from the IAEA chief himself.
"Most probably, at the end of this military conflict, the material will still be there and the enrichment capacities will be there, perhaps some infrastructure will still be there," Grossi told NPR.
Iran, he explained, is "a very big country" with a sophisticated scientific, technological, and industrial base. Its nuclear program spans universities, facilities, and labs. The "most advanced parts" have been "knocked down" — but "there is much more."
This is the core paradox of the 2026 Iran war. President Trump and Prime Minister Netanyahu have repeatedly cited Iran's advancing nuclear program as a primary justification for military action. But the war itself has:
- Destroyed verification infrastructure. IAEA inspectors cannot access bombed sites to confirm whether nuclear material has been moved, diverted, or is intact.
- Created incentive for dispersal. Iran's new Isfahan underground facility suggests Tehran was already moving to scatter its nuclear capabilities before the war. The bombing of Natanz entrances only accelerates this logic.
- Broken diplomatic channels. The Geneva nuclear talks collapsed before the current war. The Oman-mediated indirect talks "yielded no breakthrough," as the AJC documented.
- Eliminated the very officials who could negotiate. Israel's assassination campaign — killing Ali Larijani (SNSC secretary general), Basij commander Gholamreza Soleimani, and Intelligence Minister Esmail Khatib within 48 hours — has systematically removed the people who would be needed for any future nuclear deal.
Historical Precedent: The Osirak Paradox
The pattern is well-established in nonproliferation history. Israel's bombing of Iraq's Osirak reactor in 1981 was supposed to end Saddam Hussein's nuclear ambitions. Instead, it drove the program underground, dispersed it across dozens of secret sites, and made it harder for inspectors to track. When UN inspectors finally gained access after the 1991 Gulf War, they discovered Iraq's nuclear program was far more advanced than pre-bombing estimates suggested.
The same dynamic appears to be unfolding in Iran. Grossi's admission that he cannot verify the status of 440.9 kg of 60% enriched uranium — material that could theoretically be enriched to weapons-grade — represents the worst-case scenario for nonproliferation advocates: the known unknowns have become unknown unknowns.
Chapter 4: Scenario Analysis
Scenario A: Verification Eventually Restored (25%)
Premise: A ceasefire leads to renewed IAEA access. Inspectors verify nuclear material locations. A new framework replaces the dead JCPOA.
Trigger conditions: Mojtaba Khamenei consolidates power and agrees to negotiate; U.S. domestic pressure (midterms, stagflation) forces Trump to seek an exit.
Historical parallel: Post-1991 Iraq UNSCOM inspections — intrusive but eventually effective until political will collapsed.
Why 25%: The dual-power crisis in Tehran, the assassination of negotiating partners, and the precedent of Iran blocking inspectors since June 2025 all work against this scenario. The current trajectory favors opacity, not transparency.
Scenario B: Permanent Verification Black Hole (45%)
Premise: The war ends without resolving nuclear questions. Iran retains its enriched uranium stockpile at unknown locations. The IAEA cannot verify peaceful intent. The world adjusts to living with an opaque Iranian nuclear capability.
Trigger conditions: A prolonged, inconclusive conflict. Iran disperses nuclear material across underground sites. IAEA access is partially restored but remains insufficient for meaningful verification.
Historical parallel: North Korea post-2003 — IAEA expelled, no verification framework, de facto nuclear weapon state.
Why 45%: This is the natural trajectory of the current conflict dynamics. Iran has already blocked inspectors for nine months. The new Isfahan facility demonstrates ongoing dispersal. Grossi's Washington statements suggest the IAEA is already preparing the international community for this outcome.
Scenario C: Nuclear Breakout Acceleration (30%)
Premise: The war's destruction of diplomatic channels and security infrastructure, combined with the assassination of key officials, pushes Iran's surviving hardliners to pursue rapid nuclear weaponization as the only guarantee against future attacks.
Trigger conditions: IRGC dominance in post-Khamenei succession; collapse of civilian oversight; perception that only nuclear weapons can deter further U.S.-Israeli strikes.
Historical parallel: South Africa's nuclear program development under military threat (though South Africa later denuclearized); Pakistan's 1998 tests following Indian nuclear tests.
Why 30%: Grossi acknowledged enrichment capacities will survive the war. Iran's 440.9 kg of 60% uranium, if still intact, is months from weapons-grade enrichment. The logic of survival favors breakout, especially if Iran's new leadership concludes that the lesson of the war is that non-nuclear states get bombed.
Chapter 5: Investment Implications and Market Impact
The Nuclear Risk Premium
The Bushehr incident introduces a new dimension to the already severe energy crisis: nuclear risk. If the war inadvertently causes a radiological release at Bushehr — even a minor one — the Persian Gulf could face contamination that would shut down desalination plants across the GCC, affecting freshwater supply for tens of millions.
Energy sector: Brent crude, already at ~$100, would face additional nuclear risk premium. European gas prices (TTF), already up 86% since the war began, would spike further on fears of Gulf supply chain collapse.
Nuclear sector: The paradox for civilian nuclear energy is that the war simultaneously validates energy diversification away from fossil fuels (bullish for SMR developers like Rolls-Royce, NuScale, and X-Energy) while raising fears about nuclear facility vulnerability in conflict zones (bearish for sentiment).
Defense sector: Missile defense stocks — Lockheed Martin (PAC-3, THAAD), RTX (Patriot), Kongsberg (NASAMS) — benefit from the demonstrated inability to protect critical nuclear infrastructure. The Golden Dome initiative, central to today's Takaichi-Trump summit, gains urgency.
Uranium miners: Cameco, Kazatomprom, and uranium spot prices face countervailing forces. Demand for civilian nuclear fuel rises with the global nuclear renaissance, but supply disruption risk increases if the conflict damages Russian supply chains (Rosatom supplies Bushehr fuel).
The Fed Dimension
The FOMC's decision to hold rates at 3.5%–3.75% on March 18 — with Powell declaring he will stay at the Fed until the Pirro probe is "well and truly over" — reflects the impossible policy environment the war has created. The dot plot still signals one cut in 2026, but seven of 19 FOMC participants now expect no cuts at all this year. Nuclear risk adds another layer of uncertainty to an already stagflationary backdrop.
Conclusion
The cruelest irony of the 2026 Iran war is this: the conflict was partly launched to address nuclear proliferation concerns, but it has made nuclear verification impossible, nuclear dispersal more likely, and a nuclear-armed Iran more probable in the long run.
IAEA chief Grossi's admission in Washington — that the war will not eliminate Iran's nuclear program and that the agency cannot verify the status of weapons-grade enrichable material — should be the story that dominates strategic analysis. Instead, it is buried beneath the daily drumbeat of assassinations, missile strikes, and oil price swings.
The world is sleepwalking into a nuclear verification vacuum. At the end of this war, we may not know whether Iran has a bomb. That uncertainty is, by itself, a form of proliferation — because every neighboring state will plan as if the answer is yes.
Sources
- IAEA statement on Bushehr, March 18, 2026
- AP News, "What to know about Iran's Bushehr nuclear power plant," March 18, 2026
- The National, "Nuclear site or 'empty hall'? Mystery of Iran's new enrichment facility at Isfahan," March 18, 2026
- NPR, "War can't entirely eliminate Iran's nuclear program, the U.N. atomic energy chief says," March 18, 2026
- Reuters, "IAEA does not know status of new Iranian enrichment facility in Isfahan," March 18, 2026
- CNBC, "Fed holds rates steady as oil prices soar," March 18, 2026
- CNN, "Powell says he'll stay until Pirro probe is over," March 18, 2026
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